Blade-clamp for saw-frames.



No. 800,099. JPATENTED SEPT.'19, 1905.

J. GRIEVE. Y

BLADE CLAMP FOR SAW FRAMES.

APPLICATION FILED JAN. 26, 1905.

WITNESSES; INVENTOR 'efahzes rieve; l

v BY w A ORNEY UNITED STATES PATENT OFFICE.

JAMES GRIEVE, OF DoDeE CITY,\KANSAS, ASSIGNOR OF ONE-HALF To CLYDE BELLISOR McGLURE, or DODGE CITY, KANSAS.

BLADE-CLAMP FOR SAW-FRAMES;

Specification of Letters Patent. Application filed January 25, 1905. Serial No. 242,614.

No. 800,099. I Patented Sept. 19, 1905.

T 66 whom it may concern:

Be it known that I, J AMES GRIEVE, a citizen of the United States, and a resident of Dodge City, in the county of Ford and State of Kansas, have invented a new and Improved Blade- Clamp for Saw-Frames, of which the following is a full, clear, and exact description.

Ordinarily the frame of a hacksaw or other saw-frame of a like character is furnished with two clamps for gripping. the ends of a sawblade, so that the blade when rendered taut will be adapted for service. The clamps usually employed each consist of a jaw fixed upon a member of a saw-frame that is mated with a loose jaw that is clamped upon the fixed jaw I by means of set-screws which require the use either of a screw-driver or a pair of pliers for turning them, and thus force the loose jaws upon the ends of the saw-blade that have been introduced between respective clamps.

The object of my invention is to provide a novel, simple, and inexpensive clamping attachment for each of the ordinary bladeclamps on a saw-frame which affords convenient means for reliably securing the ends of a saw-blade in clamped condition thereon and that may be quickly and readily adjusted for clamping or releasing the saw-blade without requiring the use of pliers or any other implement to eifect such an adjustment of the improved attachment.

The invention consistsin the novel construc tion and combination of parts, as is hereinafter described, and defined in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a side viewof a hacksawhaving the improvement mounted upon the ordinary clamping means for detachably securing a'saw-blade by its ends on the frame. Fig. 2 is an enlarged plan view of an ordinary clamp on a hacksaw and of the improvement mount- .ed thereon, the ordinary clamping device and the improved attachment being clamped upon an end portion of a saw-blade. Fig. 3 is a plan.

view of the same, but showing the clamp and the improved attachment adjusted for the introduction of an end of asaw-blade. Fig. 4: is a longitudinal sectional View of details substantially on the line 4 4 in Fig. 2, showing Fig. 5 is a detached perspective view of the improved saw-blade clamp after it is bent for service, and Fig. 6 is a per spective view of the improved clamp before a limb thereon is bent into hook form.

The improvement hereinafter described is designed for use on any kind of frame whereon a saw-blade is to be held in a taut condition, the drawings showing one form of sawframe upon which it may be applied.

The saw shown in. Fig. l is of a kind employed for cutting metal, and consists, essentially, of a back bar 6, that is'curved near one end, as at 6?, and terminates in a fixed jaw 7. The opposite end portion. of'- the back bar is held to slide neatly-in the transversely-perforated head 8 on one end of a post 8, and in said head is a set-screw 9, that by adjustment will secure the bar in the head at any point of sliding movement. A fixed jaw 10 is formed on the remaining ead of the post 8, and from said jaw at its outer end extends a grip-piece or handle 11, and, as shown-in Fig. 1, the fixed jaws 7 and 10 are disposed in the same longitudinal plane. The jaws 7 and 10 are substantially alike, consisting of fiat elongated blocks, the similar sides of which that a sawblade usually has contact with being alined.

Upon the fixed jaws 7 and 10 are respectively mounted the loose jaws 7 10, the means for adjustably holding these clampingjaws opposite the clamping-faces on the 'fixed jaws consisting of the similar set-screws 7 10 which are inserted loosely through aperforation formed transversely in a respective each corresponding fixed jaw 7 10 a threaded perforation is formed opposite said perforations in the loose jaws. Athumb-screw 12 is inserted loosely through the perforation in the loose jaw 7, preferably having a winged head 12, said thumb-screw screwing into the I threaded perforation that is opposite itsthreaded end in the fixed jaw 7 A similar thumb-screw 13 is passed through the perforation in the loose jaw 1O and is screwed into a threaded perforation formed opposite it in the fixed jaw 10.

.The hacksaw-frameand clamping means hereinbefore described is such as is usually employed for holding a saw-blade stretched between the clamping-jaws for service and is shown to clearly represent the application of the improvement, which corrects the following defect in an ordinary haeksaw or other saw frame. It has been found necessary in order to reliably secure the ends of a saw-blade between the fixed jaws and loose jaw s on the saw-frame that a screw-driver must be used for adjusting the set-screws 7 10 and then a pair of pliers or a hand-vise be employed to further tighten the winged thumb-screws 12 13 after they have been set up as tightly as possible with the thumb and fingers.

The improved attachment which will now be described enables the secure clamping of the ends of a thin saw-blade to be effected quickly without using an implement other than the hands of a person who is adjusting the blade to place on the saw-frame.

As clearly shown in Fig. 5, the improved clamping attachment for each jaw on a hacksaw-frame consists, preferably, of a strip of plate metal that is resilient, said strip being curved edgewise between its ends, so as to give it semicircular form, this portion 14 of the clamping device having an equal thickness throughout its body. One end portion of the metal strip projects tangentially from the semicircular part 14 and is thickened somewhat, but parallel on the upper and lower sides, afiording a pressurearm 14, that inclines fiatwise from the portion 14, so that when the latter is seated upon a level surface the arm will be inclined upwardly therefrom. The thickened portion 14 is marginally rectangular and has its three free edges abeveled downward and outward, as is shown in Fig. 5. The concave inner edge of the semicircular member 14 is continued toward the arm 14 terminating in an end wall I), that is substantially parallel with the adjacent side edge a of the arm 14*. A foot member 14', which may be rectangular on the edges, is formed on the remaining end of the semicircular portion 14 and has the end wall 6 as one of its edges. An upright limb 14 is formed on the outer side edge of the foot 14 and upon its free end a portion 14 is bent laterally, forming a hook member that projects above the foot and semicircular part 14, this bending being usually effected when the device is placed in position for service.

To apply the improvement for use, each one of the pair provided is strung upon the body of a respective thumb-screw 12 13, and the limb thereon engages the normally lower edge of a respective lixed jaw 7 10, the thumb-screw holding the device in position after thehook members 14" of the limb 11" are engaged with a side of the lixed jaw toward which the limb projects. ltwill be. seen that the resilient arm 14 on each o 1' the improved clamping devices will press upon the adjacent side ofa respective loose jaw T 11) and force the same away from the corresponding lixed jaw when the thumb-screw that engages the loose jaw is relaxed. if both of the loose jaws 7 10 are permitted to assume the inclined positions shown for one loose jaw in Fig. 3 and the set-screws 7" 14)" have been properly adjusted to serve as lulcrnms and coact with the thumb-screws 12 13 for compressing the loose jaws toward the lixed jaws, it will be seen that when the end portions of the saw-blade 15 are respectively introduced between the foot 14" and arm 14" on each clamping device and the thumb-screws 12 1?) are screwed for compression of the loose jaws 7 10 this will force the resilient arms 14 toward the fixed jaws 7 10 and kink the sawblade 15 near each of its ends, thus producing offset shoulders c thereon, which will prevent the end portions of the saw-blade from sliding in the clamps. It will be seen that as the hook members 14 14 are bent so as to hook upon the fixed jaws 7 or 10 said hook will hold the improved clamp in position. it will be evident that the degree of compression necessary to kink the saw-blade laterally near each end of the same can be ellected with ease, and as the edges on the foot and arm members of the improved clamps are beveled slightly the shoulders on the blade will be so shaped as to avoid breaking the blade, it being customary to anneal the end portions of blades for hacksaws to prevent them from breaking.

To strain a saw-blade and render it taut after the ends thereof are clamped upon the frame as stated, the screw 9 is first slackened, then the bar 6 is slid in the head 8, so as to stretch the blade, and then the screw is tightened, and, as before explained, the saw-blade may be rendered taut for effective service without danger of breaking it where it is clamped upon the jaws of the frame.

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent 1. A clamp for holding the ends of a sawblade clamped upon a saw-frame, comprising a slip of metal curved edgewise to produce a substantially open ring, one end portion forming a flat foot having a limb thereon, and the other afifording an arm that inclines above the plane of the foot.

2. A clamp for holding the ends of a sawblade clamped upon a saw-frame, comprising a strip of plate metal curved edgewise between its ends, forming a substantially open ring, one end of said strip projecting tangentially from the curved portiomforrning an arm that inclines upward from the plane of the curved portion, the other end of said strip affording a foot-rest having an upright limb thereon which may be bent to terminate in a lateral hook.

3. A clamp for holding the ends of a saw blade clamped upon a saw-frame, comprising adjacent edge on the arm, a limb projected up from the foot-piece at its outer edge, which is normally straight but may be bent to form a hook on the upper end of said limb that is extended toward the curved portion of the clamp.

L, The combination with a saw-frame having a fixed jaw thereon, a loose jaw, and adjusting-screws for holding the loose jaw on the fixed jaw, of a clamping means, comprising'a resilient metallic strip bent edgewise into nearly ring form, an arm on one end of the curved member, extended tangentially' -therefrom, a foot on the other end thereof,

the arm inclining up toward its end above the plane of the foot, a limb extended upward from an edge of the foot, and ahook member formed upon the free end of'the limb;

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JAMES GRIEVE.

Witnesses:

PEARL I. TREBILoooK, CLYD B. MOOLURE. I 

